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                  <biblScope unit="pp">e200333</biblScope>
                  <date type="datePub">2025</date>
                  <date type="dateEpub">2024-11-21</date>
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              <idno type="doi">10.1212/NXI.0000000000200333</idno>
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                <term xml:lang="en">spinal cord</term>
                <term xml:lang="en">MRI</term>
                <term xml:lang="en">magnetisation transfer</term>
                <term xml:lang="en">remyelination</term>
                <term xml:lang="en">longitudinal</term>
                <term xml:lang="en">Multiple sclerosis</term>
              </keywords>
              <classCode scheme="halDomain" n="sdv.neu">Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC]</classCode>
              <classCode scheme="halDomain" n="sdv.mhep.aha">Life Sciences [q-bio]/Human health and pathology/Tissues and Organs [q-bio.TO]</classCode>
              <classCode scheme="halTypology" n="ART">Journal articles</classCode>
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              <p>Background and objective: The dynamics of microstructural spinal cord (SC) damage and repair in people with multiple sclerosis (pwMS) and their clinical relevance have yet to be explored. We set out to describe patient-specific profiles of microstructural SC damage and change during the first year after MS diagnosis, and to investigate their associations with disability and SC atrophy at 5 years.Methods: We performed a longitudinal monocentric cohort study among people with relapsingremitting MS: first relapse &amp;lt; 1 year, no relapse &amp;lt; 1 month, and high initial severity on MRI (&amp;gt; 9 T2 lesions on brain MRI and/or initial myelitis). PwMS and age-matched healthy controls (HC) underwent cervical SC magnetisation transfer (MT) imaging at baseline, and at 1 year for pwMS. Based on HC data, SC MT ratio z-score maps were computed for each pwMS. An index of microstructural damage was calculated as the proportion of voxels classified as normal at baseline and identified as damaged after 1 year. Similarly, an index of repair was also calculated (voxels classified as damaged at baseline and as normal after 1 year). Linear models including these indices and disability or SC cross sectional area (CSA) change between baseline and 5 years were calculated.Results: Thirty-seven patients and 19 HC were included. We observed considerable variability in the extent of microstructural SC damage at baseline (0-58% of SC voxels). We also observed considerable variability in damage and repair indices over 1 year (0-31 % and 0-20%), with 18 patients showing predominance of damage, and 18 predominance of repair. The index of microstructural damage was associated positively with EDSS score (r = .504, p = .002) and negatively with CSA change (r = -.416, p = .02) at 5 years, independently of baseline SC lesion volume.Discussion: People with early RRMS exhibited heterogeneous profiles of microstructural SC damage and repair. Progression of microstructural damage was associated with disability progression and SC atrophy 5 years later. These results indicate a potential for microstructural repair in the SC to prevent disability progression in pwMS.</p>
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